I have been updating links on my site. I just added Liz Menichino's -
Wellsville Elementary School site (I had missed adding it last
summer). She does a neat lesson where the students learn about
Michelangelo and Leonardo Da Vinci.
Students make a plaster relief carving as they study Michelangelo
(they also do the drawing/painting laying under the table idea for
Sistine Chapel). As they study Leonardo, they do a charcoal drawing of
their sculpure - studying the soft value changes (sort of "sfumato"
shading - along with some sharp contrasts of shadows).